Auxin Transport in <i>Zea mays</i> L. Coleoptiles I. Influence of Gravity on the Transport of Indoleacetic Acid-2-<sup>14</sup>C

Naqvi, S. M.; Gordon, Solon A.

doi:10.1104/pp.41.7.1113

Cited by 55 publications

(26 citation statements)

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“…Under aerobic conditions the average counts of the lower receivers were about 2.6 times that of the upper; under anoxia this ratio is 3.9. Right and left blocks from vertical assemblies in a single gaseous (5).…”

Section: Resultsmentioning

confidence: 99%

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Auxin Transport and Geoelectric Potential in Corn Coleoptile Sections

1965

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Asyximmetry of ildoleacetic aci(l distribution has lbeen associated witlh the (levelollment of plant bioelectric l)otentials. In the absenlce of auxinl. no detectable l)otential (levelops, but Vertical orientatioin of tissues was mliaintainied during all stages of assemibly. The temiperature (llring miianipulations anid transport was 25°.As they were prepared, assemblies Nere l)laced alternatelv inito a chamber preflushed anid continuously fluslhed withl water-saturated nitrogen. or a cham1berpreflushed and colntintioously flushed with mlloist air.A 3-hlotir equilibration l)erio(l followed, during whicl the flow-rate of the niitrogeni into the gas chamber was stifficieint to redtmce the (., conicentrationi by (liltitioni to less than 0.l %. .\ l)ositive gas l)resstlre \was mliaintainle(l (ltlriing experimiienits to minimiiize the effects of possible smlall leaks in the systemii.After the equilibrationi, the miiainitenlanice blocks w-ere replaced with similarly-sized (

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Section: Resultsmentioning

confidence: 99%

“…Follo\-ing replacemiienit of the iniaiintelnanice blocks with donior blocks, 5 randomlyv selecte(d assemblies in each gas environment were reorienited to a lhorizonital (fig 1) position and(I the remaininig 5 ethanol :Liquifluor4, 71 :24:4, v/v/v). After overnight equilibration, the C14 activities were determined by scintillation couniting.…”

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Auxin Transport and Geoelectric Potential in Corn Coleoptile Sections

1965

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“…More recently Naqvi and Gordon (12) using symmetrical sources of IAA-2-14C at the apical end of the segment, found the ratio of '4C in the upper and lower halves of the segment to be 20:80. Since both Hertel and Leopold (9) and Naqvi aind Gordon (12) have shown that IAA is the only radioactive molecule to enmerge from the basal end of a Zea coleoptile segment, these experiments clearly sihow that IAA becomes asymmetrically distributed in geotropically stimulated corn coleoptiles. The data do not, however, provide any evidence that establishes by what mechanism the asymmetry arises.…”

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“…In 1926 Cholodny (2) and Went (16) suggested independently that the differential growth underlying the geotropic response was due to the establislhmiient of a lateral atlxin concentration gradient across the coleoptile. The validity of thiis suggestion has been established experimentally in a number of investigations into the distribution of both naturally occurring atixin (3,4,13) and isotopically) labeled 3-indolyl acetic acid (5,8,12) coleoptiles of Zea mays and IAA-14C, and these must be briefly discussed again.…”

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“…Several possibilities ex-ist: A) lateral movement of TAA within the segment, as had been suggested by Cholodny (2) and by WVent (16) Lateral movement may not, however, be the only process which gives rise to the asymmetric distribution of auxin in horizontal coleoptiles. Hertel and Leopold (9) originally found that the ability of vertical Zea coleoptile segments to transport IAA basipetally is affected by gravity and both Naqvi and Gordon (12) and Little and Goldsmith (10) have recenitly reported that less IAA reached a basal receiving block when the segments were inverted. The data of Little and Goldsmith (10) …”

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Relationship Between Metabolism and the Lateral Transport of IAA in Corn Coleoptiles

Wilkins

Whyte

1968

Plant Physiol.

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Abstract. The lateral movement of IAA in coleoptiles of Zea mays has been investigated under aerobic and anaerobic conditions. The IAA-1-14C was supplied asymmetrically to the apical end of the segment. The results were as follows: A) In air more 14C was found in the lower half of horizontal segments supplied with an upper donor than in the half opposite the donor in vertical segments. The enhanced lateral movement of 14C in geotropically stimulated segments of oorn coleoptiles under aerobic conditions has thus been oonfirmed. B) This increased lateral movement of 14C in geotropically stimulated segments is greatly reduced, but is not completely abollished, under anaerobic conditions. C) The lateral movement of 14C in vertical segments is significantly less under anaerobic conditions than in air. D) Under anaerobic conditions, the lateral movement of 14C in horizontal segments can be reduced to the level found in vertical segments by pre-soaking the tissue in a 1 mm solution of the metabolic inhibitor sodium fluoride for 2 hours. The inhibitor has no effect on lateral movement of '-C in vertical anaerobic segments. E) In air, sodium fluoride has no effect on the lateral movement o'f 14C in either vertical or 'horizontal segments.On

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The Root Apex of Malva Sylvestris. I. Structural Development

Byrne

Heimsch

1970

American J of Botany

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The apical organization of the primary root of Malva sylvestris was analyzed at several growth stages, beginning with the embryo, to determine the structural changes that occurred during growth. Seeds were germinated, and plants were grown under controlled conditions. There were three discrete groups of initials in the embryonic root: those of the central cylinder, cortex, and secondary columella. The secondary columella initials consisted of a plate of cells flanked by a ring of cortical initials. The lateral portion of the rootcap shared a common origin with the epidermis. During growth both the initials of the secondary columella and outer cortex produced rootcap cells. The first indication of the outer cortical initials participating in rootcap formation was observed in roots 3 cm long. In 6‐, 9‐, and 16‐cm roots the cellular continuity between the outer cortex and rootcap was marked, but in 23‐ and 33‐cm roots the histogenic continuity between the outer cortex and rootcap was not evident. In all growth stages the initials of the central cylinder and inner cortex retained their histogenic integrity.

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Auxin Transport in Zea mays L. Coleoptiles I. Influence of Gravity on the Transport of Indoleacetic Acid-2-¹⁴C

Cited by 55 publications

References 24 publications

Auxin Transport and Geoelectric Potential in Corn Coleoptile Sections

Auxin Transport and Geoelectric Potential in Corn Coleoptile Sections

Relationship Between Metabolism and the Lateral Transport of IAA in Corn Coleoptiles

The Root Apex of Malva Sylvestris. I. Structural Development

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Auxin Transport in Zea mays L. Coleoptiles I. Influence of Gravity on the Transport of Indoleacetic Acid-2-14C

Cited by 55 publications

References 24 publications

Auxin Transport and Geoelectric Potential in Corn Coleoptile Sections

Auxin Transport and Geoelectric Potential in Corn Coleoptile Sections

Relationship Between Metabolism and the Lateral Transport of IAA in Corn Coleoptiles

The Root Apex of Malva Sylvestris. I. Structural Development

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Auxin Transport in Zea mays L. Coleoptiles I. Influence of Gravity on the Transport of Indoleacetic Acid-2-¹⁴C